Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fc81e64db2357a…

MALICIOUS

PDF

69.3 KB Created: 2020-08-23 05:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a1ead6dd5c1d7cb5d99625648bdb1a47 SHA-1: cf24b5c8649ea3693bc5dce8b958741a5f02c634 SHA-256: 85fc81e64db2357ae3519465540ff4dff4529172fe3f3ec3ae360f3179ba6562
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to redirector infrastructure designed to obscure the final destination. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL 'https://ttraff.ru/pify?keyword=microscopic+haematuria+guidelines+racgp' as malicious. The document body, though heavily obfuscated, also contains this URL and other PDF links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=microscopic+haematuria+guidelines+racgp In PDF document text
    • http://files.conteanalytics.com/uploads/1/3/2/6/132695832/pasuva_mevir_xejekev_wogiboxin.pdfIn PDF document text
    • http://files.holytrinityholmfirth.org.uk/uploads/1/3/0/8/130874599/7897996.pdfIn PDF document text
    • http://zavatali.gappraisals.com/uploads/1/3/0/8/130874493/fetalosuven.pdfIn PDF document text
    • http://files.southamptonteachers.com/uploads/1/3/0/9/130969565/2b54e02ed53.pdfIn PDF document text
    • http://files.aj-flower.com/uploads/1/3/0/8/130814706/5e77625ca6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4066/0895/files/27371361543.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5175/3365/files/urbanization_group_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0715/6128/files/nazomudomun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/xadetubikudokogukukizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/troy_bilt_pressure_washer_2800_psi_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/16011110761.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/mubusog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0216/6428/files/stevie_ray_vaughan_died.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zututekafufefosapebuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/nokizux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 5492 bytes
SHA-256: 883a1c1ef0cfbec8d4dfe11da2ad2518da348bafc0be1fe811818ed5b684d770
font_01_sfnt_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 11028 bytes
SHA-256: 73aa0bd5bc57de7df4f22dae02b43729b18633a2c5a05187507eb98904323524

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